Calculator.



No. 379,145. PATENTED FEB. 18, 1908.

B.B.GLARK. CALCULATOR.

APPLICATION FILED JULY 13.1907.

2 SHEETS-SHEET 1.

Win 555155 [NVENTOR I 7 Allarney)? No. 879,145. PATENTED FEB. 18, 1908.

IE. B. CLARK.

CALCULATOR.

APPLICATION FILED JULY 13.1907.

2 SHEETS-SHEET 2 an upright slot 3 adjacent which is marked at UNITED STATES PATENT OFFICE;

Specification of Letters Patent. Patented Feb. 18, 1908.

Application filed July 13.1907. Serial No. 383.677-

To all whom it may concern:

Be it known that I, ERNEST E. CLARK, a citizen of the United States, and resident of l Colorado Springs, El Paso county, State of Colorado, have invented certain new and useful Improvements in Calculators; and my preferred manner of carrying out the invention is set forth hnthe'follnwing full, clear, and exact description, terminating with a claim particularly s ecifying the novelty.

his invention re ates to calculators, moreespecially of that type in which is employed a key-operated cylinder, althou h 1n the simpler forms of my invention t e several keys may be dispensed with and a single knob substituted.

he object of the invention is to improve the construction of devices of this character without unnecessary complication of parts or seriously increasing the cost of 'manu facture.

The invention'is exemplified in the following specification and illustrated in the drawings forming a part of this specification and wherein Figure 1 is a perated form 0 have upwardly projecting sto s 11. These latter pass through and stan in individual holes in a uide strip 12, so'that when any key isstruck it depresses the frame 6 and elevates its individual sto l1, and when the key is released .the springs 7 and the other spring 91 will return the key to its normal position.

Mounted on an upright shaft 20 within the casing is a drum or cylinder 21 whose face carries a series of columns 22, each having figures comi respectively op osite the multipliers as indicated at 4, an these fi ures in the columns are the products ofsuc multipliers by the multi hcand 2-3 which heads thecolumn and is t erefore the price per hour. However, I do not limit myself to this'use of fi ures as they can be changed according to tile work the calculator is intendto perform. It is obvious that whatever column is brought opposite the slot in the casing, the accumulated per hour for so many hours will be instantly indicated, and the mechanical part of my invention consists in the means for rotating the cylinder and sto ping it where desired.

' very simple id ea of carrying out this mechanical feature would be' to mount the cylinder on its shaft and rotate it by a knob on the outer end of the shaft, using a suitable brake as set forth below so as to hold any column in registry with the slot. A slight amplification of this idea is shown in F' 5, where the knob 24 is on a horizontal shat 25 which is geared as at 26 to the upright shaft 20. This idea might be used with a sin le cylinder as is obvious, but I View to show a second cylinder 210 connected with the first cylinder 21 by a web 211 having on its face the columns 22'though in greater number than a single cylinder could carry. This view also shows in dotted lines sprocket chains 212 at top and bottom which might be employed in place of the web to connect the cylinders, and the links of these chains are better shown in Fig. 6. It will be seen that each carries spurs orfianges 213 into and between which should be slipped cards 214 which on their faces contain the printed columns 22-thus rendering it possible to chan ethe columns at will.

. In 7 the cylinder 21 is slitted radially as at 221 and the sheet 222 containing the columns of fi ures is removably attached to thecylinder by being passed around it as shown and having its ends entered into the rspective view of the key- 0 my invention with the front p te of the casing removed and some of the 'eys omitted; Fig. 2 is an elevation of the front plate; Fig. 3 is. a horizontal section through the cyllnder and a plan view of the keys, showing part of the cylinder broken away; Fig. 4 is an enlarged detail of the trigger mechanism employed in Fig. 1; Fig. 5

view of a further mo ified manner in which the calculator sheet can be clamped upon the cylinder; Fi 8 is a detail of one key; Fig. 9 shows how t e key principle is applied to the calculator of Fig. 5.

In the various drawings the numeral 1 designates-the casing whose front plate 2 has 4 the number of hours or other multiplier for use asset forth below. Within the casing on links or other supports 5 is ivotally sus taiued a frame 6 which may be eld normally raised by a spring or springs 7. Across the lower portion of the casing extends the fulcrum rod 8 upon which are ivoted a number of key levers 9 whose bodies extend over the lower bar of the frame 6, whose front ends have removable keys 10, and whds rear ends are held down by springs 91and wages at so much i the lever is drawn to 1 ca abilities of the calculator.

n the preferred form of my device shown in the first four views, however, the descent of the frame 6 movesan L-shaped trigger as best seen in Fig. 4 and stores energy in a spring 31, and when the frame slips off the tip of the trigger the contraction of the spring restores the trigger to its initial position and pushes on a pawl 32 which en ages teeth 33 on the head of the cylinder, t e pawl being kept in enga ement .with the teeth by a spring 34. T e tip 35 of .the trig er is pivoted as shown, and a spring 36 ho (15 it normally in position as will be understood in triggers of this character. of t e cylinder depends a series of-studs 37 which are arranged oneeach in a series of concentric circles which lie over the stops 11 the slot. Thus a presses the frame 6 and through, tl'ietrigger mechanism permits the spring 31- to rotateof the various keys, andleach stud is-so located within its circle that when it engages the stop of its key the column of figures corresponding with that key is exposed.'througli depression-bf any, key; de-,

the cylinder until the proper stud'f37. contacts with the raised stop, '1 1. of the key is depressed, and the operator finds hisprod l ucts exposed. In Fig. 9 those numbered 10 in Fig. 3.

to indicate that the key arrangement cf @1 5";

last mentioned view might "be substituted for the knob arrangement 24 of Fig. 5, in

which case the cylinder 21 would be rotated orjs ml by the contraction of the spring'31 as a ove described, and this cylinder mi htbe connected by aweb 211 with anot er cylinder 210 in a properly elongated casing. Said two drums might also be connected by the sprocket chains shown in Fig. 6; but in the preferred form of my invention, the

- cylinder itself has spurs or flanges 215'on its exterior, as shown in Fig. 3, and cards 214 are sli ped therein to permit ready change of the gureson the sheet, the keys 10 or 100' being then replaced byother ke shaving corresponding indications. In e ect, any form of such s urs are practically the equiv.- alent of ,the c amping device shown .in 7, as either construction has flan es whic embrace both ed es of the card or s eet.

In any form 6 my invention, 1 preferably employ an undulating 'or ratchet-toothed are shown a few keys such This s done; onith, a I v e nga d.

track 41 on the cylinder,

40 carried by the casing or other fixed support and having its free end properly shaped to engage said track frictionally opposite the opening in the casing.

What is claimed as new is:

1. In a key-operated calculator, the combination with a casing having an upright slot in its front with figures'adjacent, a rotary device mounted therein and carrying columns of figures adapted to be exposed singly through said slot, and a brake for checking its rotation with any column opposite the slot; of .a series of key levers each having a key and a stop, a ing supports within the casing and depressed by the depression of any key, ated trigger depressed and released by the descent of said frame, a pawl on the trigger. ratchet teeth on said rotary device engaged by the pawl whereby said spring rotates or From the bottom l that when it engages its respective key-stop i thepro'per columns of figures will be exposed.

2.111 a key operated calculator, the comlunation with a casing having an upright slot in its front with figures ad acent, a rotary device. mounted therein andcarrying columns of. figures adapted; to through "said slot-,f'aird be exposed singly e for checking its rotation witl'fanylcolunui opposite the slot; of aser es 'of key levers each having a key and a stop, ,a guide; having holes iai'egui'ded "a frame o'r jtswithin the castrai (in rins ng I digger depressed and bfyf, e dlsceilt'of said frame, a pawl i dietteeth on said rotary derotates or-s'pins said device when t e frame d isengages the tr1gger',fand a'=ser1es of studs depending from said device andstanding each in I concentric circles and so located that when it engages its respective key stop the proper column of figures will be exposed.

3. In a key operated calculator, the combination with a casing having an upright slot in its front with figures adjacent, a rotary de vice mounted therein and carrying columns of figures adapted to be exposed singly through said slot, and a brake for checking its rotation with any column opposite the slot; of a series of key levers each having a key and a stop,

oneof a series of frame mounted on swingafraine mounted on swing-v engaged by a brake and hold the columns a spring actu- 1e trigger, and a'series of studs depending pression of any y t'he'piawl whereb said spring ing -supports within the casing and'depressed 3 by the depression of any key; a spring actuated trigger de ressed and released by the descent of said h" ratchet teeth on said rotarydevice engaged ame, a pawl on the trigger,

by the pawl whereby said spring rotates or I spins said device when the frame disen ages t e trigger, other s rings for counterba ancing the weight of t e frame, and a series of studs depending from said device and standing each in one of a series of concentric circles and so located that when it engages its respective key stop the proper column of figures will be exposed. I

. 4. In a key operated calculator, the combination with a casing having an upright. slot in its front with figures adjacent, a cylinder mounted therein and carrying columns of figures adapted to be exposed singly through said slot, and a brake for checking its rotation with any column op stop, a guide strip having holes through WhlCh the stops are guided, a frame mounted on swinging su ports within the casing and depressed by t e depression of any key, a spring actuated trigger depressed and released by the descent of said frame, a pawl on the trigger, ratchet teeth on said cylinder engaged by the pawl whereby said spring rotatesor spins said cylinder whenthe frame disenga es the trigger, other springs for counter alancing the weight of-the" frame,

and a series of studs depending from said de- Vice'and standing each in one of a series of concentric circles and so located that when it engages its-respective key-stop the proper column of figures will be exposed.

5-. In a key-operated calculator, the combination with a casing having an upright slot in its front with figures adjacent, a cylinder mounted therein and having upright pairs of osite theslot; of a series of key levers each iaving a key and a flanges on its exterior, and cards or sheets removably inserted in said pairs of flanges and ends and stops at their rear ends, studs on the cylinder engaging individual stops when raised and arran ed to each respectively expose a certain 00 umn of figures through said slot, means for rotating the cylinder in one direction, and mechanism whereby said means is actuated by the depression of any key.

6. In a key bination with a casing having an upright slot in its front with figures adjacent, a cylinder mounted therein and having u right pairs of flanges on its exterior, and car s or sheets removably inserted in said pairs of flanges and having columns of figures registering with those on'the casing; of a series of key levers having interchangeable keys at their front ends and stops at their rear ends, studs on the cylinder engaging individual stops when raised and arranged to each respectively expose a certain column of figures through said slot, means for spinning the dru n in one direction by stored energy, and mechanism for first storing and then releasing said energy during the depression of any key.

, In testimony whereof I have hereunto subscribed my signature this the 29th day of June, A. I). 1907.

ERNEST E. CLARK.

Witnesses:

HENRY E. NoL'rn, CLAIRE B. Jnrrnns.

operated calculator, the come 

